bits per pixel

(hardware, graphics)(bpp) The number of bits of informationstored per pixel of an image or displayed by a graphics adapter. The more bits there are, the more colours can berepresented, but the more memory is required to store ordisplay the image.

A colour can be described by the intensities of red, green andblue (RGB) components. Allowing 8 bits (1 byte) percomponent (24 bits per pixel) gives 256 levels for eachcomponent and over 16 million different colours - more thanthe human eye can distinguish. Microsoft Windows alls this truecolour. An image of 1024x768 with24 bpp requires over 2 MB of memory.

"High colour" uses 16 bpp (or 15 bpp), 5 bits for blue, 5 bitsfor red and 6 bits for green. This reduced colour precisiongives a slight loss of image quality at a 1/3 saving onmemory.

Standard VGA uses a palette of 16 colours (4 bpp), eachcolour in the palette is 24 bit. Standard SVGA uses apalette of 256 colours (8 bpp).

Some graphics hardware and software support 32-bit colourdepths, including an 8-bit "alpha channel" for transparencyeffects.

单词	bits per pixel
释义	bits per pixel bits per pixel (hardware, graphics)(bpp) The number of bits of informationstored per pixel of an image or displayed by a graphics adapter. The more bits there are, the more colours can berepresented, but the more memory is required to store ordisplay the image. A colour can be described by the intensities of red, green andblue (RGB) components. Allowing 8 bits (1 byte) percomponent (24 bits per pixel) gives 256 levels for eachcomponent and over 16 million different colours - more thanthe human eye can distinguish. Microsoft Windows alls this truecolour. An image of 1024x768 with24 bpp requires over 2 MB of memory. "High colour" uses 16 bpp (or 15 bpp), 5 bits for blue, 5 bitsfor red and 6 bits for green. This reduced colour precisiongives a slight loss of image quality at a 1/3 saving onmemory. Standard VGA uses a palette of 16 colours (4 bpp), eachcolour in the palette is 24 bit. Standard SVGA uses apalette of 256 colours (8 bpp). Some graphics hardware and software support 32-bit colourdepths, including an 8-bit "alpha channel" for transparencyeffects. AcronymsSeeBPP
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